Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern

Details Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713805n&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13805

Mathematics

Logic

4

Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

A composite analysis for extreme positive events of the Western Pacific (WP) teleconnection pattern with blocking flow configurations observed over the subpolar Far East shows that such an event in winter can trigger a persistent cold period in the polar stratosphere and, if it occurs in fall or early winter, it augments the possibility of the formation of polar stratospheric clouds. The stratospheric cooling occurs in conjunction with the weakening of upper-tropospheric planetary waves and their upward propagation into the stratosphere soon after the peak time of the WP pattern. Synoptically, this weakening of the upper-tropospheric planetary waves is manifested as westward evolution of a developing blocking high into the climatological-mean pressure trough over the subpolar Far East. This study thus presents a unique case where a blocking high can induce cooling in the polar stratosphere rather than warming.

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